Shares: The number of times an individual post is made, by a user, into a network such as Facebook, Twitter and Email.

Share widget impressions: The number of times a widget is presented to a user. This can vary depending upon the settings you indicate – namely, whether a widget is set to user-initiated (autopop = “off”) or automatically presented (autopop = “on”)

Total visits from shares: The number of users who click on a referral link who visit your site.

Revenue: The amount of referral revenue generated by referred visitors.